<?php
/**
* jsmin.php - PHP implementation of Douglas Crockford's JSMin.
*
* This is pretty much a direct port of jsmin.c to PHP with just a few
* PHP-specific performance tweaks. Also, whereas jsmin.c reads from stdin and
* outputs to stdout, this library accepts a string as input and returns another
* string as output.
*
* PHP 5 or higher is required.
*
* Permission is hereby granted to use this version of the library under the
* same terms as jsmin.c, which has the following license:
*
* --
* Copyright (c) 2002 Douglas Crockford (www.crockford.com)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* The Software shall be used for Good, not Evil.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* --
*
* @package JSMin
* @author Ryan Grove <ryan@wonko.com>
* @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c)
* @copyright 2008 Ryan Grove <ryan@wonko.com> (PHP port)
* @license http://opensource.org/licenses/mit-license.php MIT License
* @version 1.1.1 (2008-03-02)
* @link http://code.google.com/p/jsmin-php/
*/
			
class JSMin 
{
	const ORD_LF = 10;
	const ORD_SPACE = 32;
	
	protected $a = '';
	protected $b = '';
	protected $input = '';
	protected $inputIndex = 0;
	protected $inputLength = 0;
	protected $lookAhead = null;
	protected $output = '';
	
	// -- Public Static Methods --------------------------------------------------
	
	public static function minify($js) 
	{
		$jsmin = new JSMin($js);
		return $jsmin->min();
	}
			
	// -- Public Instance Methods ------------------------------------------------
	
	public function __construct($input) 
	{
		$this->input = str_replace("\r\n", "\n", $input);
		$this->inputLength = strlen($this->input);
	}

	// -- Protected Instance Methods ---------------------------------------------

	protected function action($d) 
	{
		switch($d) {
		case 1:
			$this->output .= $this->a;
		
		case 2:
			$this->a = $this->b;
		
		if ($this->a === "'" || $this->a === '"') {
		for (;;) {
		$this->output .= $this->a;
		$this->a = $this->get();
		
		if ($this->a === $this->b) {
		break;
		}
				
				if (ord($this->a) <= self::ORD_LF) {
								throw new JSMinException('Unterminated string literal.');
								}
								
								if ($this->a === '\\') {
				$this->output .= $this->a;
						$this->a = $this->get();
						}
						}
						}
						
						case 3:
						$this->b = $this->next();
						
						if ($this->b === '/' && (
				$this->a === '(' || $this->a === ',' || $this->a === '=' ||
								$this->a === ':' || $this->a === '[' || $this->a === '!' ||
								$this->a === '&' || $this->a === '|' || $this->a === '?')) {
								
								$this->output .= $this->a . $this->b;
								
								for (;;) {
								$this->a = $this->get();
						
						if ($this->a === '/') {
				break;
				} elseif ($this->a === '\\') {
				$this->output .= $this->a;
						$this->a = $this->get();
						} elseif (ord($this->a) <= self::ORD_LF) {
											throw new JSMinException('Unterminated regular expression '.
											'literal.');
											}
											
											$this->output .= $this->a;
								}
								
								$this->b = $this->next();
								}
								}
								}
								
								protected function get() {
								$c = $this->lookAhead;
					$this->lookAhead = null;
					
					if ($c === null) {
					if ($this->inputIndex < $this->inputLength) {
						$c = substr($this->input, $this->inputIndex, 1);
										$this->inputIndex += 1;
						} else {
						$c = null;
						}
						}
						
						if ($c === "\r") {
						return "\n";
						}
						
						if ($c === null || $c === "\n" || ord($c) >= self::ORD_SPACE) {
						return $c;
						}
						
						return ' ';
						}
						
						protected function isAlphaNum($c) {
						return ord($c) > 126 || $c === '\\' || preg_match('/^[\w\$]$/', $c) === 1;
						}
						
						protected function min() {
						$this->a = "\n";
						$this->action(3);
						
						while ($this->a !== null) {
						switch ($this->a) {
						case ' ':
						if ($this->isAlphaNum($this->b)) {
										$this->action(1);
						} else {
						$this->action(2);
						}
						break;
						
						case "\n":
						switch ($this->b) {
						case '{':
						case '[':
						case '(':
						case '+':
						case '-':
						$this->action(1);
						break;
						
						case ' ':
						$this->action(3);
						break;
						
						default:
						if ($this->isAlphaNum($this->b)) {
										$this->action(1);
						}
						else {
						$this->action(2);
						}
						}
						break;
						
						default:
						switch ($this->b) {
						case ' ':
						if ($this->isAlphaNum($this->a)) {
										$this->action(1);
						break;
						}
						
						$this->action(3);
						break;
						
						case "\n":
						switch ($this->a) {
						case '}':
						case ']':
						case ')':
						case '+':
						case '-':
						case '"':
						case "'":
						$this->action(1);
						break;
						
						default:
						if ($this->isAlphaNum($this->a)) {
										$this->action(1);
						}
						else {
						$this->action(3);
						}
						}
						break;
						
						default:
						$this->action(1);
						break;
						}
						}
						}
						
						return $this->output;
						}
						
						protected function next() {
						$c = $this->get();
						
						if ($c === '/') {
						switch($this->peek()) {
						case '/':
						for (;;) {
						$c = $this->get();
						
						if (ord($c) <= self::ORD_LF) {
									return $c;
									}
									}
									
									case '*':
									$this->get();
							
							for (;;) {
							switch($this->get()) {
							case '*':
							if ($this->peek() === '/') {
							$this->get();
							return ' ';
							}
							break;
							
							case null:
							throw new JSMinException('Unterminated comment.');
							}
							}
							
							default:
							return $c;
							}
							}
							
							return $c;
							}
							
							protected function peek() {
							$this->lookAhead = $this->get();
								return $this->lookAhead;
							}
							}
							
							// -- Exceptions ---------------------------------------------------------------
							class JSMinException extends Exception {}
?>